Did you go to the site I linked to?

Phonebloks.com. If you look at the article here, it says Motorola teamed up with them. So the product you see there is, more or less, a prototype of what we would actually see. Though, again, I still wouldn't rule out the idea that the final product will have a cover over the bloks.

I just ask because, reading your post, it doesn't sound like you have seen the video yet. Just past the 1:10 mark it shows and interchangeable display, along with the bloks going in.